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d region

d re·gion
D d

Transcription

    • US Pronunciation
    • US IPA
    • [dee ree-juh n]
    • /di ˈri dʒən/
    • US Pronunciation
    • US IPA
    • [dee ree-juh n]
    • /di ˈri dʒən/

Definitions of d region words

  • noun d region the lowest region of the ionosphere, extending from a height of about 60 kilometres to about 90 kilometres: contains a low concentration of free electrons and reflects low-frequency radio waves 3
  • noun d region the lowest atmospheric zone within the ionosphere, at an altitude of c. 55 to 90 km (c. 34 to 56 mi), containing the D layer 3
  • noun d region the lowest region of the ionosphere, in which the D layer develops. 1

Information block about the term

Origin of d region

First appearance:

before 1925
One of the 11% newest English words
First recorded in 1925-30

Historical Comparancy

Parts of speech for D region

noun
adjective
verb
adverb
pronoun
preposition
conjunction
determiner
exclamation

d region popularity

A pretty common term. Usually people know it’s meaning, but prefer to use a more spread out synonym. About 48% of English native speakers know the meaning and use word.
According to our data about 59% of words is more used. This is a rare but used term. It occurs in the pages of specialized literature and in the speech of educated people.

d region usage trend in Literature

This diagram is provided by Google Ngram Viewer

See also

Matching words

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